Automatic stop-valve.



No. 676,144. Patented lune ll, l90|.-

' 0. B. MARTIN.

v AUTOMATIC STOP VALVE.

A iimion filed Jan. 21, 1901.

(N0 Model.)

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jklal [zfwzfir Mew UNITED STATES PATENT 1 OFFICE.

ORIEN B. MARTIN, or AKRON, OHIO, ASSIGNOR 0F ONE-HALF TO GEORGE E. sMETTs, or SAME PLACE.

AUTOMATIC STOP-VALVE.

s'rnolrrca'rrolv forming part of Letters Patent No. 676,144, dated June 11,1901.

Application filed January 21, 1901. Serial No. 44,118; (No model) To all whom it may concern:

Be it known that I, omen B. MARTIN, a an:

zen of the United States, and a resident of Akron, county of Summit, State of Ohio, have invented certain new and useful Improve- *ments in Automatic Stop-Valves, of which I hereby declare the following to be a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and use the same.

Myinvention consists in an automatic stop;

valve employed in a circulating-pipe for gas or fluid wherever necessary to prevent escape from open cocks in case the pressure should be suddenly withdrawn from the mains.

I exemplify my invention as employed in the use of natural gas, where sometimes the flow of gas is stopped unknown to the occupants of a house and the house-burners are left open, when if noautomatiomeans where employed to shut off the main supplying gas to the house the house would be floodedwith gas as soon as the flow was resumed.

My invention further consists in the gravity-operated valve and in the means for maintaining the same in both the raised and fallen positions,with the various details of construction and combination and arrangement of parts, as hereinafter described, shown in the accompanying drawings, and specifically pointed out in the claims.

In the accompanying drawings, Figure 1 is this cylindrical chamber is placed the cylinder-valve 5, which is annularly reduced at 6 to admit of the free passage of gas or fluid through the horizontal passage 2, which will occur when the cylinder is raised above the passage.

In order to sustain the cylinder in its elevated position, the piston Z, iptegral therewith, closes the mouth of the chamber 4 be low the horizontal passage, and a small passage 8 in the stem 6, which passes downward through the piston 9, admits gas under pressure into the chamber below the piston.

It will readily be seen that in action as soon as the pressure ceases in the main the cylinder and piston will fall and the cylinder will cut off the passage 2 fromthe main until again raised. The lower position is seen in dotted lines in Fig. 1. ,When down, it is possible that gas might leak around the cylinder and get under it to raise it before the burners inthe house-have been closed and so cause aleak of the gas. In order to prevent this, I make a short passage 9 in the top of the valvecylinder, which opens into the main passage 2 when the valve is down. 1 Through this small passage gas will find its way above the valve and the pressure will retain the valve when down until it is raised by hand by means of the rod 10 below the piston. The head ofthis rod may be conical at 11 and may have a conical seat at 12 in the piston to serve as afurther protection from the leakage of gas through the passage 8.

-At 13 is seen a small vent-cock to release thefgas above the cylinder-valve when the piston is .raised to its upper position.

The advantages of this device are obvious in its simplicity and efiectiveness, since it is impossible to light burners in the house after the valve has fallen until it has been raised by hand, and the valve will instantly close Without attention if the pressure for any reason is released.

I I believe myself to be the first to provide a cross-shaped union inserted in a gas-main in which a valve-chamber intersects at right angles the main horizontal gas-passage and to insert therein a cylindrical valve constructed to be raised by the gas-pressure and adapted to fall by gravity across said main passage and into the chamber below the passage, whereby it is placed directly across the, passage and shuts off the flow therein.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. An automatic valve for a main servicepipe, comprising a cylindricalvalve, provided with a reduced stem and piston thereon, a cylindrical chamber'inclosing said valve, crossing vertically the main passage, and a pas sage through said stem and piston arranged to connect the main passage with the lower part of the cylindrical chamber when the valve is up, substantially as and for the purpose described.

2. The combination with a main servicepassage, of a vertical cylindrical chamber intersecting said passage, a cylindrical valve provided with a reduced stem and'piston secured to the lower extremity thereof, and means for sustaining the valve in its elevated position when the pressure is on the main, consisting of a passage through said stem and piston, connecting the main passage with the chamber under the piston, and means for raising the valve when fallen, substantially as described.

3. The combination with a main servicevertically said passage, a valve in said cham valve adapted to connect the main passage and the upper portion of the chamber when the valve is down, a rod in the head of said chamber, whereby the valve can be raised when fallen, and a vent-cock in the upper end of the chamber, substantially as and for "the purposes described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ORIEN B. lvmnrlii. Witnesses:

GEO. O. WlLLEi, WM. M. MONROE: 

